Permeability and resistivity estimations of SMC material particles from eddy current simulations

In this article, we estimate numerical values of a complex permeability and an electrical resistivity of soft magnetic composite (SMC) material particles. The estimations are carried out against a measured loss curve and a measured effective dynamical permeability curve. The SMC material is imitated using automatically generated geometries with control over the scalings of the geometries as well as the thicknesses of the electrical insulations between individual particles. The estimation procedure is repeated for a wide range of insulation thicknesses and scalings. Consistency with the measured effective dynamical permeability suggests the estimated relative permeability of the particles to be of the order of hundreds. An estimate of 250–500 is found. If the scalings of the geometries are chosen using a microscope image of the SMC material as a reference, the estimated resistivity of the particles is of the order of 10-7 Ωm.